Introduction
Patients and methods
Patient selection
Surgical procedure
Measurement of metal ion levels in serum
Statistical analysis
Results
Clinical characteristics of patients
Characteristic | Men | Women | Total |
p
|
---|---|---|---|---|
Number, n (%) | 19 | 21 | 40 | – |
Age, year, mean (SD) | 46.2 (9.5) | 52.0 (9.6) | 49.2 (9.8) | 0.062 |
BMI, kg/m2, mean (SD) | 25.3 (3.7) | 24.4 (2.6) | 24.9 (3.2) | 0.409 |
Diagnosis, n (%) | 0.085 | |||
ONFH | 9 (47.4) | 6 (28.6) | 15 (37.5) | |
OA | 2 (10.5) | 0 | 2 (5) | |
DDH | 4 (21.1) | 10 (47.6) | 14 (35) | |
RA | 1 (5.3) | 3 (14.3) | 4 (10) | |
AS | 3 (15.8) | 0 | 3 (7.5) | |
Others | 0 | 2 (9.5) | 2 (4.0) | |
Operated side, n (%) | 0.836 | |||
Unilateral | 13 (68.4) | 15 (71.4) | 28 (70) | |
Bilateral | 6 (31.6) | 6 (28.6) | 12 (30) | |
Prosthesis company, n (%) | 0.464 | |||
Conserve Plus | 12 (63.2) | 10 (47.6) | 22 (55) | |
BHR | 2 (10.5) | 6 (28.6) | 8 (20) | |
BMHR | 3 (15.8) | 4 (19) | 7 (17.5) | |
Depuy ASR-TM | 2 (10.5) | 1 (4.8) | 3 (7.5) |
Metal ion levels over time by sex, laterality, and BMI
Time point | Cr |
p
| Co |
p
| Mo |
p
|
---|---|---|---|---|---|---|
Preoperation | ||||||
Men | 0.70 (0.03) | 0.949 | 0.72 (0.04) | 0.949 | 0.82 (0.02) | 0.564 |
Women | 0.70 (0.03) | 0.74 (0.03) | 0.83 (0.02) | |||
Unilateral | 0.68 (0.03) | 0.478 | 0.72 (0.04) | 0.848 | 0.82 (0.02) | 0.564 |
Bilateral | 0.72 (0.02) | 0.74 (0.03) | 0.83 (0.02) | |||
BMI <25 kg/m2
| 0.73 (0.02) | 0.037 | 0.71 (0.02) | 0.196 | 0.83 (0.01) | 0.518 |
BMI ≥25 kg/m2
| 0.66 (0.02) | 0.76 (0.04) | 0.81 (0.02) | |||
3 months | ||||||
Men | 1.06 (0.16) | 0.668 | 1.55 (0.56) | 0.116 | 6.26 (1.41) | 0.253 |
Women | 1.30 (0.29) | 2.01 (0.57) | 7.23 (0.88) | |||
Unilateral | 1.15 (0.21) | 0.237 | 1.97 (0.50) | 0.866 | 6.16 (0.78) | 0.176 |
Bilateral | 1.31 (0.22) | 1.21 (0.15) | 8.86 (2.01) | |||
BMI <25 kg/m2
| 1.16 (0.22) | 0.253 | 2.97 (1.05) | 0.288 | 4.68 (0.56) | 0.235 |
BMI ≥25 kg/m2
| 1.20 (0.22) | 1.44 (0.36) | 7.41 (0.92) | |||
12 months | ||||||
Men | 1.80 (0.52) | 0.487 | 2.16 (0.59) | 0.298 | 6.91 (1.06) | 0.817 |
Women | 1.81 (0.4) | 3.19 (0.72) | 7.10 (0.78) | |||
Unilateral | 1.67 (0.37) | 0.713 | 2.32 (0.55) | 0.327 | 7.35 (0.66) | 0.540 |
Bilateral | 2.06 (0.62) | 3.50 (0.88) | 6.33 (1.39) | |||
BMI <25 kg/m2
| 3.03 (1.47) | 0.243 | 3.41 (1.86) | 0.322 | 6.86 (3.65) | 0.493 |
BM I ≥25 kg/m2
| 1.61 (0.28) | 2.60 (0.50) | 7.03 (0.6) | |||
24 months | ||||||
Men | 1.20 (0.39) | 0.04 | 2.96 (0.78) | 0.661 | 4.67 (0.42) | 0.242 |
Women | 1.88 (0.30) | 3.09 (0.59) | 5.55 (0.86) | |||
Unilateral | 1.53 (0.27) | 0.236 | 3.00 (0.46) | 0.693 | 4.84 (0.48) | 0.324 |
Bilateral | 2.08 (0.75) | 3.26 (2.04) | 7.23 (2.56) | |||
BMI <25 kg/m2
| 1.85 (0.45) | 0.938 | 3.40 (0.74) | 0.721 | 4.35 (0.74) | 0.276 |
BMI ≥25 kg/m2
| 1.47 (0.3) | 2.81 (0.60) | 5.75 (0.74) | |||
60 months | ||||||
Men | 1.17 (0.11) | 0.584 | 3.60 (0.62) | 0.361 | 7.42 (0.57) | 0.584 |
Women | 1.24 (0.28) | 2.52 (0.720 | 7.60 (1.32) | |||
Unilateral | 1.33 (0.28) | 0.855 | 2.54 (0.70) | 0.465 | 7.04 (1.25) | 0.361 |
Bilateral | 1.06 (0.06) | 3.63 (0.66) | 8.09 (0.67) | |||
BMI <25 kg/m2
| 1.29 (0.24) | 1.000 | 2.80 (0.63) | 0.850 | 7.12 (1.1) | 0.345 |
BMI ≥25 kg/m2
| 1.06 (0.08) | 3.45 (0.87) | 8.22 (0.65) |
Trends for metal ion levels during the 5-year follow-up
Category | Preoperation | 3 months | 12 months | 24 months | 60 months |
---|---|---|---|---|---|
Total | |||||
Cr, ng/ml | 0.70 (0.02) | 1.19 (0.17)*
| 1.80 (0.31)*
| 1.62 (0.25)*
| 1.20 (0.15)*
|
Co, ng/ml | 0.73 (0.02) | 1.79 (0.39)*
| 2.71 (0.48)*
| 3.04 (0.45)*
| 3.04 (0.49)*
|
Mo, ng/ml | 0.82 (0.01) | 6.78 (0.78)*
| 7.01 (0.62)*
| 5.21 (0.55)*
| 7.52 (0.73)*
|
Men | |||||
Cr, ng/ml | 0.70 (0.03) | 1.06 (0.16) | 1.8 (0.52)*
| 1.2 (0.39)*
| 1.17 (0.11)*
|
Co, ng/ml | 0.72 (0.04) | 1.55 (0.56)*
| 2.16 (0.59)*
| 2.96 (0.78)*
| 3.6 (0.62)*
|
Mo, g/ml | 0.82 (0.02) | 6.26 (1.41)*
| 6.91 (1.06)*
| 4.67 (0.42)*
| 7.42 (0.57)*
|
Women | |||||
Cr, ng/ml | 0.70 (0.03) | 1.30 (0.29)*
| 1.81 (0.40)*
| 1.88 (0.30)*
| 1.24 (0.28)*
|
Co, ng/ml | 0.74 (0.03) | 2.01 (0.57)*
| 3.19 (0.72)*
| 3.09 (0.59)*
| 2.52 (0.72)*
|
Mo, g/ml | 0.83 (0.02) | 7.23 (0.88)*
| 7.1 (0.78)*
| 5.55 (0.86)*
| 7.6 (1.32)*
|
Unilateral | |||||
Cr, ng/ml | 0.68 (0.03) | 1.15 (0.21)*
| 1.67 (0.37)*
| 1.53 (0.27)*
| 1.33 (0.28)*
|
Co, ng/ml | 0.72 (0.04) | 1.97 (0.5)*
| 2.32 (0.55)*
| 3.00 (0.46)*
| 2.54 (0.7)*
|
Mo, g/ml | 0.82 (0.02) | 6.16 (0.78)*
| 7.35 (0.66)*
| 4.84 (0.48)*
| 7.04 (1.25)*
|
Bilateral | |||||
Cr, ng/ml | 0.72 (0.02) | 1.31 (0.22) | 2.06 (0.62)*
| 2.08 (0.75)*
| 1.06 (0.06)*
|
Co, ng/ml | 0.74 (0.03) | 1.21 (0.15) | 3.50 (0.88)*
| 3.26 (2.04) | 3.63 (0.66)*
|
Mo, g/ml | 0.83 (0.020 | 8.86 (2.01)*
| 6.33 (1.39)*
| 7.23 (2.56) | 8.09 (0.67)*
|
BMI <25 kg/m2
| |||||
Cr, ng/ml | 0.73 (0.02) | 1.16 (0.22) | 3.03 (1.47) | 1.85 (0.45)*
| 1.29 (0.24)*
|
Co, ng/ml | 0.71 (0.02) | 2.97 (1.05)*
| 3.41 (1.86) | 3.40 (0.74)*
| 2.8 (0.63)*
|
Mo, g/ml | 0.83 (0.01) | 4.68 (0.56)*
| 6.86 (3.65) | 4.35 (0.74)*
| 7.12 (1.1)*
|
BMI ≥25 kg/m2
| |||||
Cr, ng/ml | 0.66 (0.02) | 1.20 (0.22)*
| 1.61 (0.28)*
| 1.47 (0.3)*
| 1.06 (0.08)*
|
Co, ng/ml | 0.76 (0.04) | 1.44 (0.36)*
| 2.60 (0.5)*
| 2.81 (0.6)*
| 3.45 (0.87)*
|
Mo, g/ml | 0.81 (0.02) | 7.41 (0.92)*
| 7.03 (0.6)*
| 5.75 (0.74)*
| 8.22 (0.65)*
|